combination electrode with DIN-plug

...with BNC-plug

pH-Quin-Teach^®
FOR USE IN SCHOOL.

This electrode has been developed especially for education purpose in schools, universities and for occupational education. It consists of a do-it-yourself kit (glass body, two quinhydrone composite electrodes in the form of rubber plugs and brass wire for discharge) which can be composed by the pupils, students or apprentices themselves. One of the composite electrodes works as a reference electrode. If a buffer solution of pH 7 is applied as a reference electrolyte solution, the combined electrode indicates a potential of 0 V, if the sample solution also has pH 7. Thus every kind of pH-meter can be connected. So the theory of potentiometric methods, especially pH-measurements as well as the relation of acid-base equilibria and redox equilibria, can be understood through practical experimentation.

There are many applications that require the analytical determination of pH, both in the laboratory and within industry, and now with the onset of new measuring techniques, such measurements are becoming commonplace. Among the existing pH electrodes presently available on the market, the most common electrodes are glass electrodes having many disadvantages especially for untrained users (fragility, calibration etc.). However, solid and strong pH-electrodes based on quinhydrone can be used for pH-measurement without calibration. Applications of the electrodes range from highly concentrated acid solutions (especially hydrofluoric acid) to alcalic solutions of pH 11. Even after large pH-steps, the reaction time is less than 15 sec. The electrodes are temporally stable over several weeks, and they can be regenerated easily. As opposed to the conventional quinhydrone electrode, the solid pH-electrodes also can be used in solutions containing oxidising or reducing components in low concentrations. As the electrodes can be produced in several forms and sizes, many new fields and applications can now be addressed in which the quality of pH data could be improved and in areas where pH-measurements were formally impossible.

Another type of pH-QuinTeach® as do-it-yourself-kit,  new from our laboratory.

The pH Soil Probe

Many chemical, biological and physical soil processes are indicated by soil pH, especially soil capacity of plant nutritives. So soil pH is one of the most common and important parameters for the characterisation of soil quality.

Several examinations have shown that pH-values strongly depend on how samples are being prepared, e.g. on proportion of soil to distilled water, on the kind of dispersion (short shaking or permanent stirring), on temperature of drying. All measuring methods need a lot of materials and time, and pH-meters have to be calibrated on principle.

A pH-probe with a solid quinhydrone composite electrode for in-situ measurement in soil has been developed. It consists of a stainless steel tube, with a screwed plastic insert at the sensor end holding a measurement electrode, a reference electrode and a temperature probe. A stainless steel tip is then attached which enables the user simply to prick into the soil. The full assembly provides excellent mechanical stability. The pH soil probe provides a full range from 0 to 9 pH.

Please inquire for further applications

Consultancy, Accessories and Service

Our many year´s experience in the development, usage and servicing of analysis instruments enables us to provide direct hands-on advice concerning our applications and we are also your reliable partners in the field of accessories, service and repairs..

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electrodes@gatgmbh.com